TlInGaAs/InP DH LEDs with small temperature variation in EL peak energy

2001 ◽  
Vol 37 (1) ◽  
pp. 49 ◽  
Author(s):  
K. Konishi ◽  
H. Asahi ◽  
O. Maeda ◽  
Y.K. Zhou ◽  
H.J. Lee ◽  
...  
Keyword(s):  
Temperature Variation ◽  
Small Temperature ◽  
Peak Energy ◽  
Small Temperature Variation

scholarly journals Latchable microfluidic valve arrays based on shape memory polymer actuators

Lab on a Chip ◽  
2019 ◽  
Vol 19 (4) ◽  
pp. 608-617 ◽  
Author(s):  
Bekir Aksoy ◽  
Nadine Besse ◽  
Robert Jan Boom ◽  
Bas-Jan Hoogenberg ◽  
Marko Blom ◽  
...  
Keyword(s):  
Shape Memory ◽  
Temperature Variation ◽  
Shape Memory Polymer ◽  
Large Change ◽  
Small Temperature ◽  
Polymer Actuators ◽  
Small Temperature Variation

Latchable microfluidic valve arrays taking advantage of the shape memory polymer's multiple stable shapes and large change in stiffness for a small temperature variation.

Observation of Small Temperature Variation of Longitudinal-Mode Peak Wavelength in TlInGaAs/InP Laser Diodes

2003 ◽  
Vol 42 (Part 2, No. 11B) ◽  
pp. L1359-L1361 ◽  
Author(s):  
Atsushi Fujiwara ◽  
Hew-Jae Lee ◽  
Akinori Imada ◽  
Shigehiko Hasegawa ◽  
Hajime Asahi
Keyword(s):  
Temperature Variation ◽  
Laser Diodes ◽  
Longitudinal Mode ◽  
Peak Wavelength ◽  
Small Temperature ◽  
Small Temperature Variation

The magnetostriction of nickel

1971 ◽  
Vol 326 (1564) ◽  
pp. 73-85 ◽  
Keyword(s):  
Temperature Variation ◽  
Power Law ◽  
Anisotropy Constant ◽  
Small Temperature ◽  
Temperature Range ◽  
The Third ◽  
Direct Measurements

The five magnetostriction constants h 1 to h 5 have been determined for nickel at 4.2, 77 and 300 K from independent measurements on two crystals. At 4.2 K, h 3 , h 4 and h 5 are all small compared with h 1 and h 2 and there is nothing to suggest that a five-constant equation inadequately represents the magnetostrictive behaviour of nickel at this temperature. Within the temperature range h 3 is positive, implying that the first anisotropy constant, K 1 increases under pressure—in agreement with direct measurements. The combinations h 1 — 1/4 h 3 +5/6 h 4 and h 2 + 1/12 + 2/9 h 5 have been measured at small temperature intervals from 4.2 to 300 K. From these the appropriate combinations of magnetoelastic constants have been determined and their temperature variation compared with the theory of Callen & Callen (1963); agreement is poor. It is concluded that the magnetoelastic constants of nickel do not follow the third power law (nor more general expressions which use the same basis) and that the first anisotropy constant does not obey the tenth power law.

The phosphorus-31 and metal nuclear magnetic resonance spectra of complexes of tin(II) and lead(II) with tricyclohexylphosphine oxide, sulfide, and selenide

1982 ◽  
Vol 60 (23) ◽  
pp. 2921-2926 ◽  
Author(s):  
Philip A. W. Dean
Keyword(s):  
High Field ◽  
Nmr Spectra ◽  
Chemical Shifts ◽  
Temperature Gradients ◽  
Large Temperature ◽  
Linear Variation ◽  
Small Temperature ◽  
Nuclear Magnetic Resonance Spectra ◽  
Small Temperature Variation ◽  
Reduced Temperature

The new stannous and plumbous complexes M(OP(C6H11)3)n2+ (n = 2 or 3, M = Sn or Pb) and [M(SP(C6H11)3)x(SeP-(C6H11)3)3−x]2+ (M = Sn or Pb) have been prepared in SO2 solution and characterized by their reduced temperature slow-exchange 31P and metal (119Sn or 207Pb) nmr spectra. No evidence could be found for complexes in which both OP(C6H11)3 and EP(C6H11)3 (E = S or Se) are coordinated to tin(II) or lead(II). The same pattern of chemical shifts is found in the 119Sn and 207Pb nmr spectra: δM(M(OP(C6H11)3)22+) < δM(M(OP(C6H11)3)32+ < δM(M(SP(C6H11)3)32+) < δM(M(SeP(C6H11)3)32+) and a monotonic but non-linear variation of δM with x for [M(SP(C6H11)3)x(SeP(C6H11)3)3−x]2+. From M(AsF6)2 in SO2 as reference, the range of the metal chemical shifts is 999–2079 ppm and 2407–7707 ppm in the 119Sn and 207Pb nmr spectra respectively. In the 31P nmr spectra, all of the appropriate two-bond M—P couplings are observed, but the fine structure expected from coupling to 31P could not always be observed in those metal nmr spectra which were measured at high field; it is suggested that these metal nmr spectra are "smeared out" by a combination of large temperature sensitivity of the metal chemical shifts and the small temperature variation allowed by the nmr spectrometer temperature controller and/or diffusion along any temperature gradients present along the length of the nmr sample.

Criticality in reactors under domain or external temperature perturbations

1991 ◽  
Vol 434 (1891) ◽  
pp. 341-367 ◽  
Keyword(s):  
Activation Energy ◽  
Asymptotic Expansion ◽  
Numerical Scheme ◽  
Dimensionless Temperature ◽  
Cylindrical Domain ◽  
Asymptotic Results ◽  
Small Temperature ◽  
External Temperature ◽  
Small Distortion ◽  
Small Temperature Variation

The conditions for the onset of thermal runaway in reactors with small non-uniformities is investigated. The reaction is modelled by an Arrhenius heat generation term with a finite activation energy and the dimensionless temperature, u 0 , is taken to satisfy a nonlinear equation of the form Δ u 0 + λ 0 F ( u 0 ) = 0, x ∈ D ; ∂ v u 0 + bu 0 = 0. x ϵ∂ D . We investigate three classes of perturbations of this problem. First, we treat a small temperature variation maintained on the boundary of the domain. Secondly, we consider a small distortion of the boundary of a circular cylindrical domain, and thirdly, we analyse the effect of a small hole in the domain. In each case we derive asymptotic expansions for the critical Frank-Kamenetskii parameter, λ c ( ϵ ), where ϵ is a measure of the size of the perturbation. A numerical scheme is then used to determine numerical values for the coefficients in the asymptotic expansion of λ c . Finally, some of the asymptotic results are compared with corresponding numerical results obtained from a full numerical solution of the perturbed problem.

scholarly journals Experimental Study on Hygrothermal Deformation of External Thermal Insulation Cladding Systems with Glazed Hollow Bead

2016 ◽  
Vol 2016 ◽  
pp. 1-14 ◽  
Author(s):  
Houren Xiong ◽  
Jinming Xu ◽  
Yuanzhen Liu ◽  
Shimeng Wang
Keyword(s):  
Experimental Study ◽  
Growth Rate ◽  
Thermal Insulation ◽  
Early Stage ◽  
Strain Gauges ◽  
Insulation Layer ◽  
Small Temperature ◽  
Strain Behavior ◽  
Strain Data ◽  
Small Temperature Variation

This research analyzes the thermal and strain behavior of external thermal insulation cladding systems (ETICS) with Glazed Hollow Beads (GHB) thermal insulation mortar under hygrothermal cycles weather test in order to measure its durability under extreme weather (i.e., sunlight and rain). Thermometers and strain gauges are placed into different wall layers to gather thermal and strain data and another instrument measures the crack dimensions after every 4 cycles. The results showed that the finishing coat shrank at early stage (elastic deformation) and then the finishing coat tends to expand and become damaged at later stage (plastic deformation). The deformation of insulation layer is similar to that of the finishing coat but its variation amplitude is smaller. Deformation of substrate expanded with heat and contracted with cold due to the small temperature variation. The length and width of cracks on the finishing coat grew as the experiment progressed but with a decreasing growth rate and the cracks stopped growing around 70 cycles.

Chemical Species Identification in an SEM by Changes in Emitted X-Ray Energies

1974 ◽  
Vol 32 ◽  
pp. 570-571
Author(s):  
R. H. Duff
Keyword(s):  
Species Identification ◽  
Valence Electron ◽  
Chemical Species ◽  
X Rays ◽  
Chemical Bonds ◽  
Small Shift ◽  
X Ray ◽  
Electron Transitions ◽  
Peak Energy ◽  
Chemical Combination

A material irradiated with electrons emits x-rays having energies characteristic of the elements present. Chemical combination between elements results in a small shift of the peak energies of these characteristic x-rays because chemical bonds between different elements have different energies. The energy differences of the characteristic x-rays resulting from valence electron transitions can be used to identify the chemical species present and to obtain information about the chemical bond itself. Although these peak-energy shifts have been well known for a number of years, their use for chemical-species identification in small volumes of material was not realized until the development of the electron microprobe.

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